Based on your knowledge of physical and biologic factors that impact productivity and the set of buoy b. Following the spring transition in March-April, when winds and alongshore currents reverse to predominantly northerly direction, surface temperature decrease because of downwelling, delaying phytoplankton, zooplankton and benthic productivity until September-October. c. Following the spring transition in March-April, surface temperatures decrease because of upwelling, leading to increases in nutrients which peak in June and are followed by peaks in phytoplankton biomass (July), zooplankton biomass (August) and benthic biomass (September). d. Following the spring transition in March-April, surface temperatures decrease because of upwelling, leading to increases in nutrients and phytoplankton, which peak in June and are quickly followed by peaks zooplankton and benthic biomass within a few weeks. a. The spring transition starts in March-April with a change in wind and alongshore current velocities leading to increases in temperature that eventually drive higher productivity in June-July by phytoplankton and zooplankton..